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Rotatable Wire Matrix Printhead

Publishing Venue

IBM

Related People

Thornhill, WJ: AUTHOR

Abstract

U.S. Patent 4,010,835 covers the concept of a wire matrix printhead having a pair of rows of wires arranged on a head which is rotatable so as to position the head at a variety of angles to vary the angular spatial relationship between the individual wires in the two rows.

Country

United States

Language

English (United States)

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Rotatable Wire Matrix Printhead

U.S. Patent 4,010,835 covers the concept of a wire matrix printhead having
a pair of rows of wires arranged on a head which is rotatable so as to position the
head at a variety of angles to vary the angular spatial relationship between the
individual wires in the two rows.

The present structure is a variation of this basic structure wherein the
printhead is rotated to and maintained at such an angle that the perpendicular
projection of the center of each wire upon a line representative of the linear
direction of movement of the printer escapement must be equidistant from the
same projection upon this line by each of its adjacent wires, and the center of the
wires in each row will lie on a common line parallel to the linear direction of the
movement of the printer escapement.

This may be observed with reference to the figure. Printhead 10 contains two
rows of wires 11 and 12. The printhead is at a position rotated with respect to its
center 13 such that the projections, such as 14, 14', 14'', and 14''', of the wires
upon line 15, indicating the direction of the escapement, equidistant from each
other by a distance d. The wires in each row, such as 16 and 17, have their
centers on a line 18 which is parallel to line 15.

In the present example, an optimum angle of rotation of the printhead from an
axis perpendicular to the direction of the escapement is 30?. Other rotational
angles are possible, depending on the distance between the w...